Verbal agreements are in place for all three announced contests.
UFC 151 is headlined by a light heavyweight title collision between
reigning champion Jon Jones and
ex- Strikeforce
and
Pride Fighting Championships titlist Dan
Henderson. The event takes place at the Mandalay Bay Events
Center in Las Vegas and airs live on pay-per-view.

Castillo, 32, has won six of his last seven and rides a three-fight
winning streak heading into his meeting with Johnson. “Last Call”
closed out last year with victories over Shamar
Bailey and Anthony
Njokuani before kicking off 2012 with a unanimous decision win
over John
Cholish at UFC on Fox
3 last month.

Johnson, 26, arrived in the UFC as a member of “The Ultimate
Fighter” Season 12, fighting his way to the show's finals before
falling to Jonathan
Brookins at the live finale. Three wins in four fights would
follow for “The Menace,” who showed off his ever-improving standup
skills in his May 5 decision victory over “TUF 13” champion
Tony
Ferguson.

Known for his stout frame and powerful spinning back kick, Siver
saw a four-fight lightweight winning streak halted by Donald
Cerrone last October, prompting the Russian-born German to make
the cut to 145 pounds. The move proved successful, as Siver
outpointed the world-ranked Diego Nunes
in his April 14 featherweight debut in Stockholm.

A former Tachi Palace Fights champion, Yagin made his UFC debut
with a loss to Junior
Assuncao last September. “The Filipino Phenom” rebounded from
the defeat in his most recent appearance, however, taking a split
decision from former title challenger Mark
Hominick in a “Fight of the Night” performance at UFC
145.

Mizugaki, 28, made his North American debut when he challenged
Miguel
Torres for his
WEC bantamweight strap in 2009. The former Cage Force titlist
then split his next four bouts in the WEC before joining the UFC,
where he has also alternated wins in losses in his four Octagon
appearances to date, most recently dropping a split nod to Chris
Cariaso on Feb. 26.

Hougland last competed on May 15, stepping in as an injury
replacement for Mike Easton
against Yves Jabouin
at
UFC on Fuel TV 3. “Hellbound” was battered for virtually the
entirety of the contest but survived to hear the final bell. The
loss snapped a nine-fight winning streak for the bantamweight, who
earned a win over Donny
Walker in his promotional debut nearly one year ago at UFC
132.